Login failed for user & #39; xxx & #39;

At this morning, I was preparing to go to bed late. A netizen asked for help on skype, meaning that after the project database was restored, I could not log on to the project. The following error occurs:



Insus. NET told him to refer to the following method to do: http://www.cnblogs.com/insus/archive/2013/06/07/3123548.html
The response is implemented by referring to this article.
How can this problem be solved?

Next, Insus. NET still uses TeamViewer: http://www.teamviewer.com/en/index.aspx remote operations connected to the desktop of netizens. The results showed that the user's SQL Server settings were still a problem and helped him solve the problem.

The following animation is used to restore the problem status of netizens.